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\ 17-Nov-2025 Surender Singh Rothan Proof-7 Reader’s Sign _______________________ Date __________

f. 63 + 5 = g. 61 + 9 = h. 67 + 2 =

i. 68 + 5 = j. 73 + 6 =

61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

k. 84 + 4 = l. 81 + 8 = m. 82 + 4 =
n. 86 + 5 = o. 90 + 9 =

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

2. Add vertically.

a. T O b. T O c. T O d. T O e. T O

5 5 7 4 7 3 6 4 8 0

+ 4 + 4 + 6 + 4 + 9

3. Break the bigger numbers and then add.

a. 24 + 4 = b. 53 + 6 =

+ + 4 = + + 6 =

c. 77 + 2 = d. 26 + 3 =

+ + 2 = + + 3 =

AddinG tEnS

Example 1. Add 20 and 30.

Solution.

T O
+ = 2 0

+ 3 0

2 tens + 3 tens = 5 tens 5 0

Thus, 20 + 30 = 50.

108 Mathematics 1